两颗食双星AK Cam和BW Del的轨道周期变化

Study on Orbital Period Variations of Two Eclipsing Binaries:AK Cam and BW Del

为了分析食双星AK Cam和BW Del的轨道周期变化,本文从数据库O-C Gateway中收集了已发表的食双星AK Cam和BW Del的极小时刻。通过线性拟合,得到了这两颗食双星的线性历元公式和线性拟合的残差,并发现AK Cam和BW Del的O-C曲线都存在开口向上的抛物线变化。通过利用最小二乘法,获得了AK Cam和BW Del轨道周期增加率分别为3.27(±0.03)×10^-7天/年和1.14(±0.01)×10^-6天/年。对于AK Cam和BW Del,其轨道周期变化都很可能是由星风带走恒星物质导致。

The published minimum times for two eclipsing binaries of AK Cam and BW Del from O-C Gateway database were used to analyze their orbital period variation. Using linear fitting,the linear ephemeris and residuals of linear fitting were derived and the upward parabola variations of O-C curves for the two binaries were found. By using least squares,the growth rates of orbital period for AK Cam and BW Del were 3.27( ±0.03) ×10^-7 d/y and 1.14( ±0.01) ×10-6 d/y respectively. Results show that the orbital period variations of AK Cam and BW Del could be affected due to the mass carried off by the solar wind.